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geometry crossnumbers advent quadratics games spheres area speed algebra folding tube maps remainders books the only crossnumber colouring perfect numbers clocks addition floors cube numbers square grids doubling matrices median axes sequences squares square numbers hexagons time rectangles medians calculus sport proportion grids christmas ellipses expansions coordinates wordplay gerrymandering rugby dodecagons surds people maths tournaments mean chocolate shape triangles consecutive numbers multiplication planes perimeter number probability albgebra complex numbers division determinants cubics unit fractions averages triangle numbers combinatorics cryptic clues tiling elections pascal's triangle neighbours functions dominos shapes powers dates means binary probabilty decahedra cards routes dice graphs chess scales range digital products percentages regular shapes factorials ave fractions tangents balancing sum to infinity money factors integration square roots polygons consecutive integers indices volume chalkdust crossnumber circles coins crosswords logic symmetry digital clocks arrows bases 3d shapes quadrilaterals integers numbers grids taxicab geometry irreducible numbers pentagons lines cryptic crossnumbers numbers digits trigonometry odd numbers parabolas prime numbers polynomials geometric means palindromes multiples partitions even numbers sets products 2d shapes geometric mean star numbers angles differentiation menace sums